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last month "af" arrived 5 days early, light spotting on and off for 2 days, lots of pink cm.

AF til 20dpo :( not trying to discourage you, you may be preggo. just in my case i had a weird early period and mistook it for IB good luck love

i meant BFN at 20dp,

I had implantation bleeding and miscarried four days later. As long as the bleeding stops, and doesn't start again this could be IB. Keep in mind only one in three women gets IB on average.

With my first pregnancy, I had spotting on and off almost the whole time! I definitely had some brown spotting around the time I would've gotten my period but then it stopped after a couple of days. Thought it was just a light period, then got a BFP a week later! Good luck to you!!